TW202022186A - Latch needle - Google Patents

Abstract

The invention relates to a latch needle (100) for a stitch-forming textile machine, the latch needle (100) comprising a needle shaft (106) and a needle latch (110), which has a back (122), the needle shaft (106) having a slot (116) for accommodating the needle latch (110) and having a first contact portion (128) design in accordance with the back (122), the needle latch (110) being mounted on the needle shaft (106) for pivoting between an open position and a closed position about a pivot axis (120), and the back (122) lying against the first contact portion (128) in the open position, characterized in that the latch needle (100) has a damping spring (112) designed in accordance with the back (122) and/or the first contact portion (128), in order to damp contacting of the back (122) of the needle latch (110) against the first contact portion (128) in the open position.

Description

Latch needle

The present invention relates to a latch needle for stitching and forming a textile machine. The latch needle has a needle bar and a needle tongue, the needle tongue has a back, the needle bar has a slot for accommodating the needle tongue, and a Adjusted to be adapted to the first contact portion of the back, wherein the needle tongue is mounted on the needle bar to pivot around a pivot between an open position and a closed position, and the back is tied to the open position Is adjacent to the first contact portion.

From German Patent DE 1 069 812 B, a latch needle for knitting machines is known, which has a regular tongue that is pivotally arranged in a slot of the needle bar, wherein the outermost back of the tongue The tongue spoon in the position is supported by a needle bar recess as a supporting part, wherein the recess is composed of an indentation in the needle bar. The indentation is composed of the wall of the slot formed by pressing the rod material into the inside of the needle rod slot. The indentation extends the entire shaft behind the end of the needle shaft slot. The indentation is adjusted to fit the shape of the back of the spoon.

From German Patent DE 37 02 019 C1, a latch needle for stitching and forming a textile machine is known. It has a needle bar and a hook adjacent to the needle bar at the end, with a needle formed in the needle bar , A tongue slot extending along the longitudinal direction of the needle bar, and a needle tongue pivotally mounted in the tongue slot at a supporting position with a pivotal surrounding and laterally extending pivot, the latch needle carrying a tongue spoon at one end, the The tongue spoon is adjacent to the tongue rod and works together with the hook in the closed position of the tongue, and the rod of the tongue needle has an area extending from the supporting position to away from the The tip part of the tip of the tongue spoon, and has an elongated spring element, the spring element is fixed in a groove-shaped recess of the needle bar adjacent to the tongue slot in the range of one end, and the other The free end protrudes into the tongue slot and when in the closed position the pressed tongue engages an associated contact surface at the end of the tongue shaft, wherein the tongue can be elastically acted on by a spring element And the displacement, in which the shafts of the tongue bar and the needle bar sandwich an angle preferably less than 90° with each other, and the contact surface for the end of the spring element is followed by opening into the top of the tongue bar or its end At the end of the tongue bar, the needle tongue has a free surface that is released after pivoting from its middle position toward its fully open position. Otherwise, when it pivots from a front side for a distance, the end of the tongue bar The part will be separated from the compressed spring element.

In the latch needle of German Patent DE 37 02 019 C1, at the end of a pivoting movement, the needle tongue is placed on the spring element with the back of the tongue lever on a large area, in a continuous driving movement , The spring element is slightly bent from pressing down on one of the open needle tongues until the needle tongue reaches its terminal position. Once the suture releases the latch during the further driving movement of the latch needle, the spring element returning to the starting position pivots the latch to an intermediate position, where the latch will act on the contact with its end The spring elements on the surface hold.

From European Patent No. EP 0 547 331 A2, a latch needle for sewing and forming a textile machine is known. It has a needle bar and a hook adjacent to the needle bar at the end, and a horizontally extending shaft A needle tongue pivotally mounted in the tongue slot of the needle bar, the needle tongue carries a tongue spoon at one end, the tongue spoon is adjacent to the tongue shaft, and works with the needle hook in the closed position of the tongue, And the tongue rod is formed with a support hole, and has an end portion extending from the area of the support hole to the end away from the tongue spoon, and has an elongated spring element that is fixed in the range of one end The needle shaft and its other free end protrude Into the tongue slot, and at least when in the closed position, the pressed tongue engages with an associated contact surface at the end of the tongue shaft, wherein the tongue can be elastically opened in a partially open intermediate position Ground acting on the spring element to displace, wherein the tongue rod has an open edge opening extending into the supporting hole in the end portion thereof, the contact surface is arranged on the boundary of the edge opening opening, and the tongue The rod system is firmly connected to a shaft rotatably mounted in a corresponding hole in a tongue slot cheek plate defining the tongue slot.

For example, in the latch needle of European Patent No. EP 0 547 331 A2, the second leg is tied to the end of the spring element at the end of a pivotal movement with its arc-shaped end portion engaged with the end of the spring element, or configured to make the latch The back of the tongue rod is directly suspended in the spring element. With the continuous driving movement of the latch needle, the needle tongue then pushes the compressed suture downward, so that the spring element is slightly bent when the needle tongue reaches its end position.

European Patent No. EP 1 645 670 A1 relates to a latch needle, which has a tongue slot extending toward the back of the needle, and a tongue spring disposed in the range of the tongue slot extending toward the back of the needle. The tongue spring is arranged in the spring support pocket with its end, and is arranged in a middle, preferably flat area at the tongue end located in the tongue slot, and clearly, preferably under bias , One of the tongues stabilizes the back position, or a position adjacent to the closed position is substantially stabilized.

European Patent No. EP 1 197 591 A1 proposes a latch needle, which has a tongue and a spring to set at least one stable rest position different from a terminal position. In addition to this, two contact surfaces on the tongue and two pressure surfaces on the spring are used in association with each other. The spring is arranged in a tongue slot and extends across a supporting pin. The two ends of the spring are installed in the corresponding seats, and the seats are formed in the tongue and slot. The spring has two bending points, which constitute the pressing surface. When the tongue pivots in its terminal position, its outermost (back side) and its inner side are in contact with the pressing surfaces.

German patent DE 26 50 985 A1 discloses a knitting needle with a tongue and a spring attached to the rod. The spring engages with the tongue in an open position of the tongue and the spring is set at a predetermined angle. Supported by the rod, so that the tongue can move to a further open position by a yarn moving away from the hook along the rod by resisting the load of the spring. The spring is a long, flat spring member that is attached to a needle bar with one end and contacts the tongue at the other end. The widest open position of the tongue is limited by an edge surface of the rod.

The purpose of the present invention is to improve the above latch needle in terms of structure and function.

This purpose is achieved with a latch needle with the characteristics of item 1 in the scope of patent application. The preferred specific embodiments and further development are the subject of the patent application.

The latch needle can be a knitting needle or a knitting needle. The latch needle can be a short hinge needle. The textile machine can be a knitting machine or a knitting machine. The textile machine may be a circular knitting machine, particularly a large circular knitting machine. The textile machine can be a high-speed circular knitting machine, such as a fast-running circular knitting machine up to 100 revolutions per minute.

The latch needle can have a needle back and a needle top. The latch needle may have a hook. The hook can be opened toward the top of the needle. The needle hook can have a closed part that acts together with the needle tongue. The latch needle may have a stitch. The needle shaft may have a first end and a second end. The needle hook can be arranged at the first end of the needle shaft. The stitch can be arranged at the second end of the needle bar.

The needle tongue may have a closed part that works together with the needle hook. The needle tongue can have a first end and a second end. The tongue can be installed at its first end. The envelope The closed part can be arranged at the second end of the needle tongue. The tongue can be shorter. For example, the needle tongue may have a length of about 2.5 mm to about 3 mm between its seat and its closure.

The back has an at least approximately arc-shaped contour. The back can have a contact part. The contact portion of the back can have a larger radius of curvature relative to the arc-shaped contour. The contact portion of the back can be straight. In this context, the terms "arc profile" and/or "straight" should be understood, particularly with regard to the longitudinal extension of one of the tongues. The back can have a convex shape at least partially, in particular in the area of the closed part of the latch.

The slot can be defined by two cheeks. The slot can open toward the needle tip. The slot may have an arc-shaped bottom. The slot may have a back opening pointing to the back of the needle. The back opening can be arranged in the area of the needle tongue.

The first contact portion may have a contour corresponding to the geometric complementarity of the back. The first contact portion may extend at least almost across the entire width of one of the tongues. A width direction here corresponds to an extension direction of the pivot. The first contact part can be made by plastic deformation of the needle shaft, especially the cheeks. The first contact portion may have a concave shape. The first contact portion may be designed such that in the open position, an enlarged contact portion is caused between the first contact portion and the back. The first contact portion may be designed such that when the back portion contacts the first contact portion in the open position, a reduced contact force is caused based on the area.

In the open position, the hook can be opened. In the closed position, the closed portion of the needle tongue and the closed portion of the hook are adjacent to each other. In the closed position, the hook can be closed by means of the tongue.

A damping spring can be made of an elastic material, in particular a spring wire. The damping spring can be made of a material with an arc-shaped cross-section, especially a circular cross-section. The damping spring can be flat in the lateral direction. The damping spring can be flat on two opposite sides. The damping bomb The spring can be flattened by the needle bar slot defined by the cheek plate associated with one side. The damping spring can be geometrically adjusted to be adapted to the back and/or the first contact portion. The damping spring can be adjusted to adapt to the back and/or the first contact portion with respect to its damping effect. The damping spring can be adjusted to be adapted to the back and/or the first contact portion, so that when the needle tongue pivots in the opening direction, the needle tongue with its back, particularly with the contact portion of the back first and The first end of the second contact portion or the end of the contact portion side of the damping spring makes mechanical contact, and then compresses the second contact portion, wherein one of the tongues is blocked in pivotal movement, and the back, In particular, a contact area between the contact portion of the back and the second contact portion is increased, and then the back, particularly the contact portion of the back, and the second contact portion are at least almost completely in contact and/or simultaneously, or Then the back part, especially the contact part of the back part, also at least almost completely contacts the first contact part. The damping spring can be adjusted to be adapted to the back and/or the first contact portion, so that when the open position is reached, from the contact between the needle tongue on the one hand and the damping spring on the other hand to the needle on the other hand The transition of a contact between the tongue and the damping spring and the needle bar on the other hand reduces the peak force as much as possible. The damping spring may partly, particularly on a second contact portion, have a contour corresponding to the back geometry complementary and/or a contour corresponding to the first contact portion. The damping spring can be designed such that dirt entering the slot from above, between a tongue support and the spring, but also in front of the tongue support, can leave the slot downwards.

The damping spring can be used to block the pivotal movement of one of the needle tongues before the needle tongue contacts the first contact portion with the back in the open position. The damping spring can be used to reduce the pivoting speed of the needle tongue with a reduced gradient. The damping spring can be used to resist the pivotal movement of the needle tongue with reduced acceleration.

The damping spring may have a connecting part. The connecting part can be associated with the needle bar. The connecting portion may be at least approximately straight. The damping spring can be connected to the needle bar by its connecting part Connect firmly. The damping spring can be connected to the needle bar by force, shape, and/or material through its connecting portion. The damping spring may have a second contact portion. The second contact portion may be associated with the back and/or the first contact portion. The second contact portion may be at least approximately straight. The second contact portion may be shorter than the connecting portion. The second contact portion may have a first end and a second end. The first end of the second contact portion can rebound freely. The second end of the second contact portion can be clamped. The first end of the second contact portion can also be referred to as the contact portion side of the damping spring. The connecting portion and the second contact portion may be configured to form an angle with each other. The angle configuration can be used to adjust the damping spring to adapt to the back and/or the first contact portion.

The connecting portion and the second contact portion may be configured to sandwich an angle of at least 15° with each other, particularly an angle of about 20° to about 40°. This angle should now be understood as the angle deviating from a straight line equivalent to an angle of 0°. The connecting portion and the second contact portion therefore include a corresponding supplementary angle. The connecting portion and the second contact portion can be merged into each other in an arc shape.

The connecting portion may be configured to be at least approximately parallel to the needle tip. The connecting portion may be configured to extend along the needle tip. The first contact portion and the second contact portion may be configured to be at least approximately parallel to each other. The first contact portion and the second contact portion may be configured to separate from each other when the needle tongue is not pivoted to the open position.

The damping spring may have a contact portion side end. The end of the contact portion of the damping spring can also be referred to as the first end of the second contact portion. The end of the contact part side may be configured to be flush with the first contact part. The end of the contact part side can be arranged in the extension part of the first contact part.

The latch needle may have a supporting pin for pivotally supporting the latch on the needle shaft. The second contact portion may be arranged in the area of the supporting pin along the height direction. A height direction here refers to a direction perpendicular to the pivot axis and perpendicular to an extension direction of a longitudinal axis of the needle bar. A parallel projection of the second contact portion on the supporting pin can be One has at least approximately the same diameter. A width of the second contact portion may be at least approximately equivalent to a diameter of the supporting pin in the cross section.

The needle tongue can abut the second contact portion in the open position by at least one quarter of its length, in particular by approximately one third of its length. When the needle tongue is in contact with the back in the open position, a maximum contact force can be reduced by about 30 to 70%, in particular by about 50% by means of the damping spring. The remaining part of the contact force can be received by the first contact portion. In this case, the cheeks defining the slot can pop open.

When the needle tongue pivots toward the open position, the needle tongue first uses its back, particularly the first end of the contact portion of the back and the second contact portion, or the contact portion side of the damping spring Make mechanical contact at the end. Then, the second contact portion rebounds, and at the same time a pivotal movement of the tongue is blocked, and a contact area between the back, particularly the contact portion of the back and the second contact portion, increases. Then, the back, in particular the contact portion of the back, is at least almost completely in contact with the second contact portion. At the same time, or subsequently, the back, especially the contact portion of the back, is also at least almost completely in contact with the first contact portion.

The damping spring is mainly designed to block the pivotal movement of one of the tongues, so that the contact between the back and the first contact portion of the tongue in the open position is inhibited. Therefore, if necessary, a related restoring force acting on the latch in the direction of the closed position is secondary and not the purpose of the damping spring design.

Use "may" to describe the characteristics of a particular place. The reason is to provide specific embodiments with respective characteristics or multiple characteristics.

With the present invention, the load capacity of the latch needle will be increased. The maximum operating time will be increased. May prevent damage. Noise can be reduced. Downtime can be shortened. Such as time and/ Or costs and other expenses will be reduced. Productivity will increase. The peak load will be reduced. The dynamic load will be reduced. The load acting on the support pin will be reduced.

100‧‧‧Latch needle

102‧‧‧Needle back

104‧‧‧Needle top

106‧‧‧Needle bar

108‧‧‧Hook

110‧‧‧Needle

112‧‧‧Damp spring

114‧‧‧Closed part

116‧‧‧Slot

117‧‧‧Back opening

118‧‧‧Support pin

120‧‧‧Pivot

122‧‧‧Back

124‧‧‧Closed part

126‧‧‧Contact

128‧‧‧Contact

130‧‧‧Connecting part

132‧‧‧Contact

200‧‧‧Latch needle

202‧‧‧Needle bar

204‧‧‧Needle

206‧‧‧Damp spring

208‧‧‧Contact

210‧‧‧Contact

212‧‧‧Connecting part

300‧‧‧Latch needle

302‧‧‧Needle bar

304‧‧‧Damp spring

306‧‧‧Contact

308‧‧‧Slot

310‧‧‧Cheek

312‧‧‧Cheek

400‧‧‧Latch needle

402‧‧‧Needle bar

404‧‧‧Needle

406‧‧‧Damp spring

408‧‧‧Connecting part

410‧‧‧Needle top

412‧‧‧Slot

414‧‧‧Flat part

416‧‧‧flat part

Specific embodiments of the present invention will be described in more detail below with reference to the drawings. Further features and advantages will emerge from this description. The specific features of these specific embodiments may constitute the general features of the present invention. Other features related to the features of these specific embodiments may also constitute special features of the present invention.

Its display

Figure 1 is a detailed design when a latch needle with a needle bar, a needle tongue, and a damping spring pivots toward an open position,

Figure 2 is a detailed design of a latch needle with a needle bar, a needle tongue, and a damping spring in an open position,

Figure 3 shows the detailed design of a latch needle, a needle bar and a damping spring,

Figure 4 is a detailed design of a latch needle, a needle bar, a needle tongue, and a damping spring in an open position,

Figure 5 is a detailed design of a latch needle with a needle bar, a needle tongue, and a damping spring in an open position,

Figure 6 is a detailed design of a latch needle with a needle bar, a needle tongue, and a shortened damping spring in an open position,

Figure 7 is a cross-sectional view of a standard latch needle with a needle bar and a latch needle with a damping spring,

Figure 8 is a detailed design of a latch needle with needle bar, needle tongue, and lateral flat damping spring in an open position, and

Figure 9 is a latch needle and a lateral flat damping spring.

Figure 1 shows the detailed design of a latch needle 100. The latch needle 100 is used as a knitting needle in a large circular knitting machine with a fast running speed of up to 100 revolutions per minute.

The latch needle 100 extends in a longitudinal direction 1, a width direction b, and a height direction h. The latch needle 100 has a needle back 102, a needle top 104, a needle shaft 106, a needle hook 108, a needle tongue 110, and a damping spring 112. The pin back 102 is arranged at the bottom of the height direction h. The needle top 104 is arranged at the top of the height direction h. The needle bar 106 extends along an extended longitudinal axis in the longitudinal direction 1. The hook 108 opens toward the top 104 and has a closed portion 114.

The needle bar 106 has a slot 116 for receiving the needle tongue 110 therein. The slot 116 is laterally defined by two cheeks, opens to the needle top 104, and has an arc-shaped bottom and a back opening 117 pointing to the needle back 102.

The needle tongue 110 is mounted on the needle shaft 106 by a supporting pin 118 to pivot around a pivot 120 between an open position and a closed position. The latch needle 110 has a back 122 and a closed portion 124. The latch needle 110 in this case has a small length between the pivot 120 and the closing portion 124 of approximately 2.5 mm to 3 mm. The back 122 has an arc profile combined with a contact portion 126. The contact portion 126 has an arc radius larger than the arc-shaped contour, or is straight.

The needle bar 106 has a contact portion 128. The contact portion 128 of the needle bar 106 has a corresponding contour that is geometrically complementary to the back 122, and is formed into an embossed pattern by segmented plastic deformation of the needle bar 106.

The damping spring 112 is made of a spring wire and has a connecting portion 130 and a contact portion 132. The damping spring 112 is fixedly connected to the needle bar 106 by its connecting portion 130 Then, the connecting portion 130 is arranged along the needle top 104 and extends almost parallel to it. To accommodate the damping spring 112, the slot 116 is extended in the direction of the stitch. The contact portion 132 has a free elastic end and a clamping end.

The contact portions 128 and 132 are arranged almost parallel to each other. If the latch 110 is not pivoted to the open position, the contact portion 132 protrudes toward the latch 110 across the contact portion 128. The free elastic end of the contact portion 132 is configured to be flush with the extension portion of the contact portion 128.

In the closed position not shown here, the closing portion 124 of the needle tongue 110 and the closing portion 114 of the hook 108 are close to each other, so that the hook 108 is closed. When the needle tongue 110 pivots in the direction of the open position, the needle tongue 110 first, as shown in FIG. 1, makes the contact portion 126 of the back 122 and the free elastic end of the contact portion 132 of the damping spring 112 make mechanical contact . Then, the contact portion 132 of the damping spring 112 is compressed, and at the same time a pivoting movement of the tongue 110 is blocked, and a contact area between the contact portion 126 of the back 122 and the contact portion 132 of the damping spring 112 continues to increase. Then, the contact portion 126 of the back 122 abuts the contact portion 132 of the damping spring 112. Simultaneously or subsequently, the contact portion 126 of the back 122 also abuts the contact portion 128 of the needle bar 106, as shown in FIG. 2.

By the damping spring 112, one of the pivoting movements of the needle tongue 110 is thus blocked, so as to inhibit the contact of the needle tongue 110 with the contact portion 128 of the needle bar 106 with the back 122 in the open position. The pivoting speed of the latch 110 will therefore decrease uniformly while avoiding acceleration peaks.

FIG. 3 shows the detailed design of the needle bar 106 and the damping spring 112 of the latch needle 100. The connecting portion 130 and the contact portion 132 of the damping spring 112 are configured to be straight and sandwiched at an angle of about 30°, and are merged into each other in an arc shape.

4 shows the detailed design of the needle bar 106, the needle tongue 110, and the damping spring 112 of the latch needle 100 in the open position. A parallel projection of the contact portion 132 of the damping spring 112 in the longitudinal direction of the supporting pin 118 almost corresponds to a diameter of the supporting pin 118.

FIG. 5 shows the detailed design of the latch needle 110 with the needle bar 106, the needle tongue 110, and the damping spring 112 in the open position. In the open position, about one third of the length of the needle tongue 110 is close to the contact portion 132 of the damping spring 112.

FIG. 6 shows the detailed design of a latch needle 200 with a needle bar 202, a needle tongue 204, and a shortened damping spring 206 in an open position. The free elastic end of the contact portion 208 of the damping spring 206 is not flush with the extension portion of the contact portion 210 of the needle bar 202, but is disposed in the contact portion 210. A connecting portion 212 of the damping spring 206 is arranged obliquely toward the rear end of the needle top 104 along the needle tip 104. For the rest, please refer to Figures 1 to 5 and related descriptions for supplement.

FIG. 7 shows, for example, a cross-sectional view of a latch needle 100 according to FIGS. 1 to 5 or a latch needle 300 according to the latch needle 200 of FIG. 6, the latch needle having a needle shaft 302 and a damping spring 304. Obviously, the contact portion 306 of the needle bar 302 is realized by the segmented plastic deformation of the needle bar 302 into an embossing pattern. To accommodate the damping spring 304 in the slot 308 between the cheek plates 310 and 312, the slot 308 is milled after the contact portion 306 is manufactured. For the rest, please refer to Figures 1 to 6 and related descriptions for supplementation.

FIG. 8 shows a detailed design of a latch needle 400 having a needle bar 402, a needle tongue 404, and a lateral flat damping spring 406 in an open position. The connecting portion 408 of the damping spring 406 extending substantially parallel to the needle top 410 is received in the slot 412 to a depth so that the damping spring 406 is spaced from the needle top 410. The distance between the damping spring 406 and the needle tip 410 is approximately the same as the height of the damping spring 406 at the contact portion 408. 9 is a side view and a cross-sectional view along the line A-A to show the lateral flat damping spring 406 of the latch needle 400. The damping spring 406 is made of a round wire, which is tied before bending and inserting into the needle bar 402 to flatten both sides. This causes the damping spring 406 to exhibit a profile with a specially adjusted flexural modulus, so that the lateral flat portions 414 and 416 allow improved attachment in the slot 412. In addition, please refer to Figures 1 to 7 and related descriptions as supplements.

100‧‧‧Latch needle

102‧‧‧Needle back

104‧‧‧Needle top

106‧‧‧Needle bar

108‧‧‧Hook

110‧‧‧Needle

112‧‧‧Damp spring

114‧‧‧Closed part

116‧‧‧Slot

117‧‧‧Back opening

118‧‧‧Support pin

120‧‧‧Pivot

122‧‧‧Back

124‧‧‧Closed part

126‧‧‧Contact

128‧‧‧Contact

130‧‧‧Connecting part

132‧‧‧Contact

Claims (8)

A latch needle (100, 200, 300, 400) used for stitching and forming a textile machine. The latch needle (100, 200, 300, 400) has a needle shaft (106, 202, 304, 402) and a needle tongue ( 110,204,404), the needle tongue has a back (122), and the needle shaft (106,202,304,402) has a slot (116, 308, 412), and a first contact portion (128, 210, 306) adjusted to fit the back (122), wherein the needle tongue (110, 204, 404) is mounted on the needle bar (106, 202) , 304, 402) can be pivoted around a pivot (120) between an open position and a closed position, and the back (122) is tied to the first contact portion (128, 210) in the open position , 306) adjacent, characterized in that the latch needle (100, 200, 300, 400) has a damping spring (112, 206, 304, 406), adjusted to fit the back (122) and/or the first The contact portion (128, 210, 306) is used to restrain the pin tongue (110, 204, 404) from contacting the first contact portion (128, 210, 306) with the back (122) in the open position. For example, the latch needle (100, 200, 300, 400) of the first item in the scope of the patent application, wherein the damping spring (112, 206, 304, 406) has a needle bar (106, 202, 304, 402) related The connected connecting portion (130, 408), and a second contact portion (132, 208) associated with the back (122) and/or the first contact portion (128, 210, 306), wherein the connecting portion (130, 408) and the second contact portion (132, 208) are configured to have an angle with each other, for adjusting the damping spring (112, 206, 304, 406) to adapt to the back (122) and/or the first Contacts (128, 210, 306). For example, the latch needle (100, 200, 300, 400) of the second item in the scope of the patent application, wherein the connecting portion (130) and the second contact portion (132, 208) are arranged at an angle of at least 15°, In particular, an angle of about 20° to about 40° is included. For example, the latch needle (100, 200, 300, 400) of any one of items 2 to 3 of the scope of patent application, wherein the first contact portion (128, 210, 306) and the second contact portion (132 , 208) are arranged to be at least approximately parallel to each other. For example, the latch needle (100, 200, 300, 400) of any one of items 1 to 4 of the scope of patent application, wherein the damping spring (112, 206, 304, 406) has a contact part side end, And the end is configured to be flush with the first contact portion (128, 210, 306). For example, the latch needle (100, 200, 300, 400) of any one of items 1 to 5 of the scope of patent application, wherein the latch needle (100, 200, 300, 400) has a supporting pin (118) , Used to pivotally support the needle tongue (110, 204, 404) on the needle bar (106, 202, 304, 402), and the second contact portion (132, 208) on the support pin (118 A parallel projection system on) is at least approximately equivalent to a diameter of the supporting pin (118). For example, the latch needle (100, 200, 300, 400) of any one of items 1 to 6 of the scope of patent application, wherein the damping spring (112, 206, 304, 406) has a connection with the back (122 ) And/or the second contact portion (132, 208) associated with the first contact portion (128, 210, 306), and the needle tongue (110, 204, 404) in the open position by at least its length A quarter, in particular about a third of its length, adjoins the second contact portion (132, 208). For example, the latch needle (100, 200, 300, 400) of any one of items 1 to 7 of the scope of patent application, wherein, when the latch (110, 204, 404) is in the open position and the back (122) During contact, the damping spring (112, 206, 304, 406) reduces a maximum contact force by about 30 to 70%, especially by about 50%.

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